<template>
  <div class="login-container">
    <div class="login-box">
      <!--头像区-->
      <div class="avatar_box">
        <img src="../assets/logo.png">
      </div>
      <!--登录表单区-->
      <el-form ref="login_form_ref" label-width="0" class="login_form" :model="login_form" :rules="form_rules">
        <el-form-item prop="username" >
          <el-input v-model="login_form.username" prefix-icon="el-icon-user-solid"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input v-model="login_form.password" prefix-icon="el-icon-lock" type="password" @keyup.enter.native="login"></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="reset_form">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data(){
    return{
      //表单数据对象
      login_form:{
        username:"",
        password:""
      },
      //表单验证规则
      form_rules:{
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password:[
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 16, message: '长度在 6 到 16 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods:{
    //重置表单
    reset_form(){
      this.$refs.login_form_ref.resetFields();
    },
    login(){
      this.$refs.login_form_ref.validate(async (valid)=>{
        if(!valid)return;
        const result=(await this.$http.post("login", this.login_form)).data;
        if(result.meta.status!=200){
          return this.$message.error('登录失败');
        }
        else this.$message.success('登录成功');
          //将登录成功之后的token，保存到客户端的sessionStorage中
          //项目中除了登录之外的其它API接口，必须在登录之后才能访问
          //token只应在当前网站打开期间生效，所以token保存在sessionStorage中
          //通过编程式导航跳转到后台主页，路由地址/home
        window.sessionStorage.setItem("token",result.data.token);
        this.$router.push("/home");
      });
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped lang="less">
  .login-container{
    background-color: #2b4b6b;
    height: 100%;
  }
  .login-box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
  }
  .avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    background-color: #fff;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    img{
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
  .login_form{
    position: absolute;
    width: 90%;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
  }
  .btns{
    display: flex;
    justify-content: flex-end;
  }
</style>
